i didnt even mention the additives in the "gas" in vapes which makes people want to come back to it again and again, most vapes u find are flavoured, so generally appeals to the more younger range of teenagers, whereas, now, people may smoke beacuse they see other people doing it
and if you are looking for an explaination of addiction in simple terms: imagine you got no sleep over the weekend but you got a very important and very busy week ahead of you working 12hrs+ and so you have some strong coffee every day that week, the next week, even though you dont need the coffee, you will still have it, you wouldnt feel like you can function with out it. addiction to coffee is usually mild, but if you drink tea/ coffee, trying to not one day can be hard, for people who smoke/ vape this effects them on a larger scale.